4 



a tube, by the action of the animal, the arras or tendrils arc 

 employed in laying hold of the particles of sand and applying 

 them to the yet adhesive surface. 



TEREBELLA. 

 GENERIC CHARACTER: Tube lengthened, cylin- 

 drical, slender and pointed at the base; membranous, 

 with grains of sand and fragments of shells adhering 

 round it; open only at the top. 



* T. CHRYSODON. Sabella C. Mont. Test. Brit., vol. 2, 



p. 546. Common in firm sand, near low water mark; in 

 some places thickly studding the ground. 



* T. CONCHILEGA. Sabella C. Pen. Brit. Zo., vol. 4, 

 pi. 26, lower figure. Stew. Elem., vol. 2, p. 423. Mont. 

 Test. Brit., vol. 2. p. 547. On dead shells from deep 

 water. 



* T. LUMBRICALIS. Sabella L. Stew. Elem., vol. 2, 

 p. 423. Mont. Test. Brit., vol. 2, p. 549. Common, on 

 shells, from deep water. 



T. CJRRATA. Sabella C. Mont, Test. Brit., vol. 2, p. 550. 

 This is the largest, stoutest, finest, but most brittle, of the 

 British species. It lives in deep water, and is probably 

 less rare than it seems to be. 



The above form the whole of the species comprized in 

 the kindred Genera Sabellaria and Terebella that I can 

 venture to include in the list of Cornish Shells. But 

 although differently allied, Sipliunculus Strombus (Fleming's 

 British Animals, p. 491) must also be enumerated among 

 creatures which construct their habitation of agglutinated 

 sand. This it does by straitening the orifice of the shell of 

 Rostellaria Pes Pelecani ; and forming it into an elevated 

 nest, within which its takes up its permanent abode. 



AMPHITRITE. 



GENERIC CHARACTER. Tube lengthened, cylindrical, 

 the hinder extremity tapering, membranous or leathery; 

 the outer surface generally naked. 



A. PENICILLUS. Sabella P. Mont. Test. Brit, vol. 2, 

 p. 541. Cylindrical, size of a crow quill, 3 inches long, 

 tapering and a little flexuous at the base, where alone it is 

 fixed; the upper portion free, and floating. The surface 

 smooth, as if covered with a muddy coating, nearly black, 

 and finely marked with circular lines. On the Pinna 

 Ingens, and sometimes on Sertularia Abietina growing 

 on it: from the depth of 40 or 50 fathoms. 



SERPULjEA, 

 Tube solid, calcareous; the branchiae covered with an 



operculum. 



